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Effect of finishing on Knit Fabrics

Effect of finishing on Knit Fabrics

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Effect of finishing on Knit Fabrics

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  1. Southeast University School of Science and Engineering, Department of Textile Engineering Effect of finishing on Knit Fabrics Effect of finishing on Knit Fabrics 1

  2. Southeast University School of Science and Engineering, Department of Textile Engineering Introduction  Textile finishing is a term commonly applied to different processes that the textile pretreatments, dyeing or printing for final embellishments to enhance their attractiveness and sale apparels well as for comfort and usefulness. materials undergo after  Finishing process improves the physical properties of fabric like feel, softness, tensile strength, elongation, G.S.M, dia, shrinkage, spirality, twisting, and insulation properties. Effect of finishing on Knit Fabrics Dhaka,15.05.2011 2

  3. Southeast University School of Science and Engineering, Department of Textile Engineering The techniques of finishing depend on the following: • Nature of the fabric, i.e. chemical composition, state, weave, etc. This determines the appearance, i.e. transparences, luster, fullness, weight, whiteness, etc. • The physical properties of the fabric, i.e. feel, softness, stiffness, tensile strength, elongation, shrinkage property, insulation etc. • The end-use of the material i.e. non-shrinking, non-creasing, stiffening etc. • Receptivity of the fabric to various finishing operations, i.e. water-proofing, flame-proofing, rot-proofing etc. • Susceptibility to chemical modifications. Effect of finishing on Knit Fabrics Dhaka,15.05.2011 3

  4. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing treatments are basically meant to give the textile material certain desirable properties like:  Softness  Lusture  Pleasant handle  Drape  Dimensional stability  Crease recovery  Antistatic  Non-slip  Soil release Effect of finishing on Knit Fabrics Dhaka,15.05.2011 4

  5. Southeast University School of Science and Engineering, Department of Textile Engineering Definition of Finishing Finishing is a term usually employed for process other than scouring, bleaching, dyeing or printing, to which the fabric are subjected to improve their appearance, properties & serviceability. Effect of finishing on Knit Fabrics Dhaka,15.05.2011 5

  6. Southeast University School of Science and Engineering, Department of Textile Engineering Classification of Finishes  The most common classifications are: • Aesthetic finishes: • Functional finishes  Textile finishes are also categorized as: • Mechanical finishes (Dry finishes) • Chemical finishes (Wet finishes) Effect of finishing on Knit Fabrics Dhaka,15.05.2011 6

  7. Southeast University School of Science and Engineering, Department of Textile Engineering Classification of Finishes Finishes can also be classified by their degree of performance as follows: • Permanent finishes • Durable finishes • Semi-durable finishes • Temporary finishes Effect of finishing on Knit Fabrics Dhaka,15.05.2011 7

  8. Southeast University School of Science and Engineering, Department of Textile Engineering Controling parameter of finishing • Dia of the fabric • GSM of the fabric • Shrinkage of the fabric • Weight loss or gain • Tension control • Temparature of different stage • Spirality control etc. • Color fastness of the fabric etc. Effect of finishing on Knit Fabrics Dhaka,15.05.2011 8

  9. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing process Process of finishing for Open fabric Unload fabric from Dyeing Hydro extracting Dryer/Stentering Open compacting Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 9

  10. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing process Process of finishing for Tube fabric Tube form fabric Dewatering Dryer for drying Slitting Tube compacting Stentering Open compacting Effect of finishing on Knit Fabrics Dhaka,15.05.2011 10

  11. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing terms GSM: GSM means fabric weight in grams per square meter’s . Fabric Weight In Grams length In m    GSM   2 Effect of finishing on Knit Fabrics Dhaka,15.05.2011 11

  12. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing terms Shrinkage: The amount of shrinkage for any given knit fabric is primarily dependent upon the product specifications and the knitting parameters used to meet those specifications. Formula of shrinkage % measurement:  Before Wash Length After Wash Length   Length Wise Shrinkage % 100 Before Wash Length  Before Wash Width After Wash Width   Width Wise Shrinkage % 100 Before Wash Width Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 12

  13. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing terms Spairality: “Spirality” constituent’s yarns of plain fabric, causing all loops to distort and throwing courses into an angular relationship arises from twist stress in the the fabric wales and Dhaka,15.05.2011 Color fastness of dye goods. 13

  14. Southeast University School of Science and Engineering, Department of Textile Engineering Finishing terms Color fastness: The stability of color or its fastness is one of the most important requirements customers. Colour fastness of dyed goods means the resistance power of dyed goods against any hazards. The color textiles show different resistance power to different agencies such as light, wash, rubbing, perspiration, water, bleach, acid, alkali etc. of valuable Effect of finishing on Knit Fabrics . . Dhaka,15.05.2011 14

  15. Southeast University School of Science and Engineering, Department of Textile Engineering Effect of Hydro and Dewatering  If water remove from fabric is very much percentage than fabric surface show crease mark, this fault can’t be remove.  If length wise run the fabric then 20% shrinkage occurs.  If breakdown occur of de-twister than puckering occurs.  If twist problem occur than it effect on knit garments.  If do not take proper ballooning than folding mark occurs. Effect of finishing on Knit Fabrics . . Dhaka,15.05.2011 15

  16. Southeast University School of Science and Engineering, Department of Textile Engineering Effect of Hydro and Dewatering  If squeeze roller/padder pressure is high than fabric surface show pressure mark.  If over feed dia of delivery side is not perfect than length wise shrinkage occurs.  If dia increase than become poor shrinkage properties.  Dia increase in this stage because it helps to better work for dryer & slitting.  Dia mark also occurs in this stage. Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 16

  17. Southeast University School of Science and Engineering, Department of Textile Engineering Effect of slitting  If dia is less than basket dia than fabrics do not cut and if dia is greater than basket than GSM problem occurs.  Cut the fabric break wales line wise.  Basket dia must be less then fabric dia. Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 17

  18. Southeast University School of Science and Engineering, Department of Textile Engineering Effect of Stentering  Over feed tension is very important for this stage.  If over feed decrease than length increase.  More over feed give in white fabric.  If need light shade of the fabric than increase padder pressure.  If need dark shade of the fabric than temperature increase 20˚C.  For Lycra heat setting temperature need (190-200) ˚C.  If half feeder Lycra fabric than increase speed and decrease temp.  If full feeder Lycra fabric temp need 200˚C.  Heat setting takes for width fixed of Lycra fabric. Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 18

  19. Southeast University School of Science and Engineering, Department of Textile Engineering Effect of Compacting Many compaction as a means of shrinkage control. Compaction is a method whereby the course themselves. Different machines techniques to accomplish this. classifications of compaction: heated rolls and shoe units or belt shrinking units. Both methods rely on speed differential and their patented compaction zones to accomplish the compaction. Tubular and open-width systems are available. The fabric is steamed to add moisture and then introduced to the compacting zone. The compaction mechanism, moisture, forces the length stitches (courses) to be compacted. textile manufacturers have, and still do, rely on loops are compressed a are basically upon incorporate There variety of two along with heat and Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 19

  20. Southeast University School of Science and Engineering, Department of Textile Engineering Results and discussion For finding the effect of finishing on knit fabric some experiment are done on different types of knit fabric. Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 20

  21. Southeast University School of Science and Engineering, Department of Textile Engineering Compare the GSM change for Single jersey and single jersey lycra fabric GSM GSM 136 200 134 195 132 190 130 185 128 180 126 GSM 175 124 122 170 120 165 118 160 116 155 Grey Dyeing Slitting Stentering Compacting Grey Heat setting Dyeing Slitting Stentering Compacting GSM variation Stages Effect of finishing on Knit Fabrics . . Dhaka,15.05.2011 21

  22. Southeast University School of Science and Engineering, Department of Textile Engineering Compare the Variation of GSM for 1×1 rib fabric and Interlock fabric GSM GSMChange 210 230 205 220 210 200 200 195 190 190 180 185 170 Grey Dyeing Slitting Stentering Compacting 180 Grey Dyeing Slitting Stentering Compacting Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 22

  23. Southeast University School of Science and Engineering, Department of Textile Engineering Compare the variation of GSM for fleece fabric and Pique GSM 220 GSM 235 210 230 225 200 220 190 215 210 180 205 170 200 Grey Dyeing Slitting Stentering Compacting Brushing Grey Dyeing Slitting Stentering Compacting Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 23

  24. Southeast University School of Science and Engineering, Department of Textile Engineering Compare the shrinkage % change for Single jersey and single jersey lycra fabric width% length% 3 Width% Length% 2 1 1 0 0 Dyeing Slitting Stentering Compacting Shrinkage% -1 -1 -2 -2 -3 -3 -4 -4 -5 -5 Dyeing Slitting Stentering Compacting Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 24

  25. Southeast University School of Science and Engineering, Department of Textile Engineering Compare the Variation Shrinkage % for 1×1 rib fabric and Interlock fabric length% width% Length% Width% 1.0 0.5 1 0.0 0 -0.5 -1 -1.0 -1.5 -2 -2.0 -3 -2.5 Dyeing Slitting Stentering Compacting Dyeing Slitting Stentering Compacting Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 25

  26. Southeast University School of Science and Engineering, Department of Textile Engineering Compare the shrinkage % of fleece fabric and Pique length% width% Length% Width% 3 1.0 2 0.5 1 0.0 0 -1 -0.5 -2 -1.0 -3 -1.5 -4 Dyeing Slitting Stentering Compacting Dyeing Slitting Stentering Compacting Effect of finishing on Knit Fabrics . Dhaka,15.05.2011 26

  27. Southeast University School of Science and Engineering, Department of Textile Engineering Spirality % change for Single jersey and single jersey lycra fabric Spirality% Spirality% 3.0 4.5 4.0 2.5 3.5 3.0 2.0 2.5 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0.0 Dyeing Slitting Stentering Compacting Dyeing Slitting Stentering Compacting Dhaka,15.05.2011 Effect of finishing on Knit Fabrics . 27

  28. Southeast University School of Science and Engineering, Department of Textile Engineering Spirality % change for 1×1 rib fabric and Interlock fabric Spirality% Spirality% 2.6 2.5 2.4 2.0 2.2 2.0 1.5 1.8 1.0 1.6 1.4 0.5 1.2 1.0 0.0 Dyeing Slitting Stentering Compacting 0.8 Dyeing Slitting Stentering Compacting Dhaka,15.05.2011 Effect of finishing on Knit Fabrics . 28

  29. Southeast University School of Science and Engineering, Department of Textile Engineering Spirality % of fleece fabric and Pique spirality% 3.2 Spirality% 3.0 3.0 2.8 2.6 2.5 2.4 2.2 2.0 2.0 1.5 1.8 1.6 1.0 1.4 Dyeing Slitting Stentering Compacting Dyeing Slitting Stentering Compacting Effect of finishing on Knit Fabrics Dhaka,15.05.2011 29

  30. Southeast University School of Science and Engineering, Department of Textile Engineering Discussion Effect of finishing on Knit Fabrics Dhaka,15.05.2011 30

  31. Southeast University School of Science and Engineering, Department of Textile Engineering References • http://www.thesmarttime.com • Books of Finishing ,By-Petro Bellini,Ferruccio Bonetti. • Lecture sheet of Dr. Zulhash Uddin • Experimental data from Paddma poly cotton knit fabrics Ltd. Effect of finishing on Knit Fabrics Dhaka,15.05.2011 31

  32. Southeast University School of Science and Engineering, Department of Textile Engineering Acknowledgement We would like to express many thanks to our honorable teacher Md. Fazley Elahi for giving us a very good opportunity for presenting ourselves. We also thanks our parents who encouraged us every step of our life. Lastly thanks all of you give kind attention for this presentation ceremony who are Effect of finishing on Knit Fabrics Dhaka,15.05.2011 32

  33. Southeast University School of Science and Engineering, Department of Textile Engineering Thank you ALL for your Attention Effect of finishing on Knit Fabrics Dhaka,15.05.2011 33

  34. Southeast University School of Science and Engineering, Department of Textile Engineering

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